/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory.config;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * Immutable placeholder class used for a property value object when it's a
 * reference to another bean name in the factory, to be resolved at runtime.
 *
 * @author Juergen Hoeller
 * @see RuntimeBeanReference
 * @see BeanDefinition#getPropertyValues()
 * @see org.springframework.beans.factory.BeanFactory#getBean
 * @since 2.0
 */
public class RuntimeBeanNameReference implements BeanReference {

    private final String beanName;

    @Nullable
    private Object source;


    /**
     * Create a new RuntimeBeanNameReference to the given bean name.
     *
     * @param beanName name of the target bean
     */
    public RuntimeBeanNameReference(String beanName) {
        Assert.hasText(beanName, "'beanName' must not be empty");
        this.beanName = beanName;
    }

    @Override
    public String getBeanName() {
        return this.beanName;
    }

    /**
     * Set the configuration source {@code Object} for this metadata element.
     * <p>The exact type of the object will depend on the configuration mechanism used.
     */
    public void setSource(@Nullable Object source) {
        this.source = source;
    }

    @Override
    @Nullable
    public Object getSource() {
        return this.source;
    }


    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }
        if (!(other instanceof RuntimeBeanNameReference)) {
            return false;
        }
        RuntimeBeanNameReference that = (RuntimeBeanNameReference) other;
        return this.beanName.equals(that.beanName);
    }

    @Override
    public int hashCode() {
        return this.beanName.hashCode();
    }

    @Override
    public String toString() {
        return '<' + getBeanName() + '>';
    }

}
